I only did the big equipment pieces like weapons and armor. Can we use mundane pathfinder equipment or should we just stick to the WoT book?
A Sihedron Ring would be very useful for a Warder, plus the tower being able to use the wring to observe/track Den has a lot of narrative potential.
If I had to pick though, it'd be a Starsling Buckler. One of my favorite magic items. It strikes such a good balance of mechanically and narrative utility.